Broadcast Reflectors with a "dimple" design diffuse LED light evenly throughout the aquarium * Expandable design allows up to four fixtures to be linked together with included hardware * Adjustable width Frame Mounts hold fixture securely above the aquarium * Durable on/off rocker switch for convenient lighting control * 460nm blue color ideal for accenting T5HO lighting * Broadcast Reflectors ? with a ?dimple? design diffuse LED light evenly throughout the aquarium